condition mean min max ZT0-3 8.948263 8.948263 8.948263 ZT4-7 65.6266875 65.6266875 65.6266875 ZT8-11 89.4828215 89.4828215 89.4828215 ZT12-15 22.6793245 22.6793245 22.6793245 ZT16-19 9.175548 9.175548 9.175548 ZT20-23 7.45864 7.45864 7.45864